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Elasticity of a Pseudoproper Ferroelastic Transition from Stishovite to Post-Stishovite at High Pressure
Physical Review Letters ( IF 8.1 ) Pub Date : 2021-01-12 , DOI: 10.1103/physrevlett.126.025701
Yanyao Zhang , Suyu Fu , Baoyun Wang , Jung-Fu Lin

Elastic moduli (Cij) of single-crystal stishovite and post-stishovite are determined using Brillouin light scattering, impulsive stimulated light scattering, and x-ray diffraction up to 70 GPa. The C12 of stishovite converges with the C11 at 55GPa, where the transverse wave VS1 propagating along [110] also vanishes. Landau modeling of the Cij, B1g optic mode, and lattice parameters reveals a pseudoproper type ferroelastic post-stishovite transition. The transition would cause peculiar anomalies in VS and Poisson’s ratio in silica-bearing subducting slabs in the mid-lower mantle.

中文翻译:

高压下从斜辉石到后斜辉石的伪适当的铁弹性转变的弹性

弹性模量C一世Ĵ使用布里渊光散射,脉冲激发光散射和高达70 GPa的X射线衍射确定单晶的辉石和辉石后晶。的C12 的辉石与 C1155GPa,其中横波 V小号1个沿着[110]传播也消失了。Landau的建模C一世Ĵ1个G光学模式和晶格参数揭示了伪适当类型的铁弹性后stishovite过渡。过渡会导致特殊的异常V小号 下地幔中含二氧化硅俯冲板中的泊松比。
更新日期:2021-01-12
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